Door-check.



No. 685,804. Patented Nov. 5, |90I. H. G. VDIGHT N. B. HUHD.

DUUR CHECK.

(Application led Febu, 1899., (No Model.) 2 Sheets-Sheet I.

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' Patented Nov. 5,1901.

.H. G. VOIGHT &. N. B. HURD.

D 0 0 R C H E C K (Application led Fgb. 6, 1899.1

2 Sheets-Sheet (No Model.)

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HENRY G. VOIGHT AND NORMAN B. HURD, OF NEW BRITAIN, CONNECTICUT, ASSIGNORS TO THE RUSSELL d: ERIVIN MANUFACTURING COMPANY, OF

NEIV BRITAIN, CONNECTICUT.

DOOR-CHECK.

SPECIFICATION forming' part of Letters Patent No. 685,804, dated November 5, 1901. Application led February 6, 1899. Serial No. 704,620. (No model.)

To @ZZ whom t may concern:

Be it known that we, HENRY G. VOIGHT and NORMAN B. IIURD, citizens of the United States, residing in New Britain, in the county of Hartford and State of Connecticut, have invented certain new and useful Improvements in Door-Checks, of which the following is a specification.

Our invention relates to improvements in xo door-checks; and the main object of our invention is to provide a check especially-adapted for checking a door that swings both ways.

In the accompanying drawings, Figure l is a front elevation of our door-check, the guideplate being shown in vertical section. Fig. 2 is a plan view ofthe same. Fig. 3 is a vertical section of a portion of the same on the line c 0; of Fig. 2, the crank-shaft, crankarm, and crank-pin being shown in elevation.

zo Fig. 4 is a reverse plan View of our check with the cap of the crank-chamber removed. Fig. 5 is a like view of the same with the piston-slide drawn partly back and the crankshaft moved one-quarter of a revolution.

A designates the cylinder, and B the body of the case, provided with a bracket-plate 6 for securing the said case to a door. Within the said case is a crank-shaft '7, carrying a crank-arm 8 and crank-pin 9, either with or 3o without a friction-roller. IVithin the cylinder is an ordinary piston (not shown) and piston-rod 10, which may be connected by any suitable means to the piston-slide 1l. The generic features of a door-check with a pis- 3 5 ton-slide having an oblique slot and a crank with its pin in said slot for reciprocating the slide and piston are made the subject of a companion application, Serial No. 704,474., filed February 4, 1899, Patent No. 632,291, dated 4o September 5, 1899, and therefore this application, in so far as the crank and slide are concerned, is confined to a slide having the two inclined slots. The said piston-slide is provided with two oblique slots 19, that slant 4 5 from the axial line of the piston-rod outwardly in opposite directions, the two slots together forming a il-shaped slot with the outer or rear most point of the V rounded off, as shown in Figs. land 5, on a curve whose center is substantially the inner point of the V, so that said slot may be substantially filled at all points by the diameter of the crank-pin 9. The under side of the piston-slide and crankarm are covered by the cap or under plate 12, Fig. 3.

For what We may call a universal 'connection for double-acting doors we prefer the connecting or operating mechanism shown in Figs. land 2, which may be applied either to doors with one broad side flush with the 6o face of the casings or to doors which are set in more or less relatively to the faceof the casings. In this illustration the crank-lever 13 is odset at 14. to bring its outer end to one side of the axis of the cylinder, and said outer end is provided-with a headed pin or roller 15. The guide-plate 16 is slotted longitudinally, as shown at 17, the width of the slot being iitted to the body of the headed pin or roller. The slot 17 at one end is enlarged, 7o as at 18,' sufficiently to let the head of the headed pin or roller pass endwise through it. The guide-plate is provided with ordinary screw-holes, whereby said plate may be secured to the Woodwork immediately over the top edge of the door,and thus bring the cranklever into the proper position to force the piston home when the case B is attached to the door in the relative position to the guideplate shown in Figs, l and 2. Figs. 3 and 4 8o show the parts in the saine position, it being understood that the door is closed. With this connection thus applied it is wholly immaterial whether the face of the casings be iiush with one side of the door or not. While we prefer the connection illustrated in Figs. l and 2, it is evident that any other connections that will give the Crank-shaft a like movement may be substituted therefor without changing the operation of the crank-shat t and the piston-slide.

Our check is designed for use with any ordinary double-swinging doors, which may be closed by any suitable springs or force applied in any ordinary manner, and conse- 95 quently no spring is necessary for the crankshaft. v

The check is designed to have its crank-pin at the apex of the V or double-inclined slot when the door is closed, as shown in Figs. 3 loo and 4. Upon opening the door the crank-pin is forced up one or the other oi the slots 19, thereby forcing the piston-slide and piston back from the position shown in Fig. 4 to that shown in Fig. 5 when the crank-shaft has been moved one-quarter of a revolution. In said Fig. 5 we have shown the crank-pin as having moved along the upper one of the slots 19; but the movement of the pistonslide and attached piston is precisely the same no matter which way the door opens or which slot the pin travels in. It' the door is opened more than enough to give a quartertu rn to the crank-shaft, the slide moves bac-k continuously until its right-hand end roaches the point indicated by the broken-line contour in Fig. 5, the pin then being near the middle of the length of the slot, where it travels a short distance without imparting any movement to the slide; but if motion to the crank is continued far enough to give a half-revolution to the crank it is brought into the apex of the V-shaped slot and the slide is moved forward-that is, to the leftand carried nearly, but not quite, to the position illustrated in Fig. 5 for the quarterturn. The closing movement of the door when released to the force of its spring or springs moves the crank in the reverse direction and forces the piston into the cylinder to check the door.

rlhe extreme limit of the backward movement of the slide upon a half-revolution of the crank-shaft from the position shown in Fig. 4 is indicated at the right-hand end of Fig. 5 by the broken-linecontour. The position of the slide at a quarter-revolution of` the crank-shaft from the position shown in Fig. 4 is shown by full lines in Fig. 5.

We are aware that a prior patent shows and describesY a liquid door-check for a door that swings either tothe right or to the left, although swinging one way only, the said check having a single crank-arm With its pin in a doubly-inclined slot of a slide that moves at right angles to the movement of the piston, the angle of inclination of said slot being much nearer a right angle to the movement of this slide than it is to forty-five degrees thereto, and we hereby disclaim the same.

By means of the crank-pin and piston-slide in our check having the doubly-inclined slot at about forty-live degrees to the axis of the piston the movement of the piston-slide is substantially uniform for a given movement of the crank-shaft during its tirst quarterrevolution in opening the door. In other ter ofl a revolution of said shaft in closing the door, a very important matter in a pneumatic check, whereas the reverse is true in a door-check having'a slot extending at right angles to the slide, or much more nearly Vt0. a right angle, as in the door-check hereinbefore disclaimed.

It is apparent that some changes from the derstood as limiting ourselves to the precise within the spirit and scope of the same. Y We claim as our inventionl. The combination of a door-check case havingacylinderWiththecrank-shaftmounted in said case at a right angle to the length of said cylinder, a crank-arm and crank-pinY on the said shaft, a piston moving longitudinally within said cylinder, theY piston-slide Sol.

rigidly connected with the said piston and: j having the two oppositely-iuclined slots within which the said crank-pin is arranged, the said two slots extending at about forty-five meeting each other in a right angle,and mech- Y851 degrees to the axial line of the piston andV f anism for connecting the said crank-shaft Y and door-check case witha frame and a door Y that swings both to the right and to the lef t, substantially as described.

2. The combination of a door-check case,hav

ing a cylinder made-rigid with the said case, Y n

with the piston-slide mounted within guides in the said case to slide in the longitudinal direction of the said cylinder and having the two oppositely inclined and connected slots arranged at substantially a right angle to each other and extending at about an angle of forty-tive degrees to the axial line of the said cylinder, the piston within said cylinder rigidly connected with the said piston-slide for moving simultaneously therewith in the same Y direction, the crank-shaft arranged at rightY angles to the said cylinder and having a crankpin working within the said slots and mechanism for connecting the said crank-shaft and door-check case with a'frame and a door that Y swings both ways, substantially as described.

HENRY G. VOIGHT.

NORMAN B. HURD.

Witnesses:

M. S. WIARD, P. M. BRoNsoN. 

